Bobbin-controlling adjunct for sewing-machine shuttles



Jan. 8, 1929. 1,698,392

R. N. CORTHELL BOBBIN CONTROLLING ADJUNCT FOR SEWING MACHINE SHUTTLES Filed April 27, 1927 JjahrU/rfill,

bin

Patented Jan. 8,- 1929.;

1,698,392 UNITED, STATES PATENTTOFFICEQ,

ROBERT N, CORTHELL, 0F AUBURN, MAINE, ASSIGNOR 'ro sUMMr'r THREAD GOM- PANY, or EAST HAMPTON, CONNECTICUT, A CORPORATION or MAINE.

BOBIBIN-CONTBOLLING AnJUNorr non SEWING- A HIN sHUTTLns.

, Application filed April 27, 1927. Serial No. 186,860.

V This invention relates to a bobbin composed of an annular thread mass universally wound on a paper cop tube. A bobbin of this description is commonly used in a shuttle known as the Singer D 12, which includes a bobbin case composed of a head and an annular wall, the wall having a thread- 7 come fouled with parts of the shuttle, the

proper course 'ofthe thread from the bobbin to the stitch-forming mechanism bemg through the inner or closed end of the threading slot and between the external" surface of the wall andthe usual tension device on said external surface. If the bobbin is of less than the predetermined lengthintended for this type of shuttle, the abovementioned liability of fouling the thread exists in a marked degree and is often the cause of annoyance and loss of time.

My invention has for its object to obviate the abovementioned liability and ensure the proper passage of the thread from the bobto the stitch-forming mechanism through the threading slot. This object is attained by the employment of an adjunct engageable by friction with the tube of. a

ready wound bobbin so that it is adapted to rotate therewith and be transferred from the tube of a spent bobbin to the tube of a full one, the adjunct including a spring adapted to bear on a supporting portion of a shuttle adjacent the bobbin case and press one end of the bobbin against the head of said case, thus ensuring the maintenance of the opposite end in position to prevent the thread passing therefrom from sliding out of the mouth of the threading slot.

Of the accompanying drawings,

Figure 1 is a plan view of a shuttle to which a bobbin having my improved adjunct is applicable.

Figure 2 is a section on line 2-2 of Figure 1, the bobbin case being shown in elevation.

Figure 3 shows in section on line 33 of F lgure 2 and on a larger scale,the bobbin case, and a bobbin therein having my improved adjunct. j

. Figure4 is a face view of the. adjunct looking tow-ardthe outer face thereofi Figure 5 is a section on line 5 53of Figure 4. 2

Figure 6 is a] sectional showing the adjunct alone.

Figure 7 is a sectional perspective view showing the bobbin and the adjunct applied thereto. V 1

The same reference characters indicate the same parts inall the figures.

A bobbin to which my invention relates shown by Figures 3, 6 and 7 includes .a paperspective view per cop tube 12 and an annular thread mass 2 close frictional fit in the bore of the cop tube 12. The spring includes an ear 17 (Figure 4) which is soldered, brazed, electrically welded, or otherwise rigidly secured to the outer face of the head 14 near the margin thereof andat one side ofthe tubular shank 16, and a free annular shoe 18 integral with the ear and maintained thereby yieldingly spaced from the outer side of thehead as shown by Figures 5, 6 and 7. The central openlng 19 of the annular shoe coincides Wit-hthe bore of the tubular shank 16 and is formed to receive the hub portion 20 (Figure 3) of the usual center post 20 on which the bobbin case of a shuttle of the typeillustrated, is mounted. The bobbin case in this type of shuttle is composed of a head 21 and an annular curb or wall 22 hav ing an inclined threading slot 23 extending from the open end of the wall partly to the head, and terminating in an enlargement covered by the usual tension'device'24. The

I thethreatlie drawn ofii The shoe 18 beers head usually hasa tubularcenter post 25 (Fi ure which reeeives the center pest 20 of t e shuttle. The post 20 is supported by a member 35 ofthe shuttle body. 7 a When the-shuttle is in operation the bob-t tubular shank 16 being frictionally engaged with the bore of the eoptube'so that the adjunct is,,in effect, apart of the bobbin, the adjunct and bobbin rotating as a unit as' on the Shuttle member 35 as shown by Figure 3,-and maintains the outer enclfof the bobbin against, the head, 21 of the bobbin case, and the, inner end' ofthe bobbin-offset slab and is not liable to slide out of said mouth and become fouled. or entangled with any-part of the shuttle, t H t Theurtubul sh nk lfiwhen frietionall engaged with the tube 12 of an 0 erative' hebhin; ecu the head 14 and the elwe 18' to the bobbin as indicated by Figure 7, the

hebhin and the. adj nct b i g edept d he n ta led as a mat, i -theshuttle-t When the o bin is spent, the adjunct maybe withdrawn fronu'the eoptube and inserted in the tube of an *mFI erati e'bQbbin,

use

My impx oved 1a unet is not limited to n ashutjtle 01: the particular type hereshowm- Figure 3 shows' a sheet metal head 2'? Covering the outer end'rof the bobbin and mugged rtriththe 0,0? tube thereot'by a tubular shank28. Thisuhead is wellknown and is'not claimed 1 I V I claim: "bin rotates vabout the posts QOMand 25 the I by me;

For" use with a sett ing inaehine shuttle of the charaeter referre'cllto, having a head: 1 atone end and a threading-1 elet formed in its annular all and open atjone' end, and

a bobbin, cempriei'ng a cop tube and an annular thread mass Wount l thereon and having slightly convex end surfaoee; saiclease being adapted to noveboclily relative to the shuttle int-he elirectienof the length ofthe eop tu- W the shuttle s pel' tl g, a be in controlling adjunct composed of a coneaved annular heed formed tqbear on the inner end of the bobbin and pi'ovid'ed wlth tubu} 'lur shank formed to e1 1ter and frictionally engage the, cop tube, and a re silient sheet 5 metal spring comprising a; freeannularfsjhqe lyieldingly connected to the hegct dm m tained Spa d li r i mby en-e r, th r fice of said shoe coineidiugwithtthe "tubular shank of theheacl to receiirethehub oflthe being adapted to, bear on ainember oflthe signature.

. it a e shuttle post about; which" the bobbin, head t and, springlare rotatable as a unit, the spring a 

